Electrical heater.



M. H. SHOENBERG L G, T. MARSH.

ELECTRICAL HEATER.

APPLICATION FILED JAN.28,1909.

j. fc4( INVENTORS wlTNEssE',

MILTON H. SHOENBERG 4^fo GEORGE T. MARSH BY wgw.

THEIR ATTOFHEY STATES PATENT OFFICE.

HILTON -H. BHOENBEB`G-AND GEORGE T. MARSH, 0F SAN FRANCISCO, CALIFORNIA, ASSIGNOBB TO APPLIANCE AND ELECTRIC DEVICE COMPANY, A CORPORATION 0l' Speincation of Lettenlatenvt! Patented Nov. 22, 1910.

' 'onmoanm ELECTRICAL HEATER.

Application filed January 28, 1909. Serial No. 474,790.

To all 'whom 'it fm1/y concern:

Be it known that we, Minion H.' Stroma-v BERG, a citizen of the United States, and Gnoaon. T. MARSH, a citizen of Australia, both residing in the city and countypf San Francisco'and State of California, have invented certain new and useful Improvements in Electrical Heaters, of which the` following is a specification.

Our inventionY relates tc-improvements in electrical heaters. v

It consists in the construction of a resistance unit or element, in the form of a device which is capable of beingused as an immersion, fluid heater, as an element for stoves, radiators, and for such pur oses generally,as such devices may be emp oyed for.

Referring to the accompanying drawings for a more complete explanation of our invention,-Fi ure 1 is a sectional elevation of a unit. ilg. the line ig. `1. Fig. 3l is a view' show'- ing the invention as applied. Fig. l4: is a view showing the invention as connected inl series. Fi 5' is a erspective in section of a modifie .form. ig. 6v is a perspective showing the invention as applied 1n heating.

It is the object of our invention to provide what may be termed a unit or element. complete in itself, and in readiness to be emplo ed 'for any of the'purposes to Awhich it 1s tted, by simply introducing it to the po-l sition-where it 1s to be operated, and connecting its. terminals with the source of an electrical current; and these inde ndent units may be added to or multiplied, orming a series of any desired extent. When return wires are employed in resistance coils of this et so hot ployed, and cause a short circuit. In the present device a metal core A is shown as 1n the form of a flat plate of suicient length, width and thickness, and this core is inclosed with an insulating material 2, such as micaor the like. Around this insulating material is wound the resistance elem int 3 which may consist of a wire, either nuked, or thinly coated with a substance which is resistant of moisture, and which may also be an insulatin 'coating for the wire. This wire is coile around the outside of the core and if not in itself insulated, witha sudicient distance between the turns so that the insulating coating 2 will 2 is an enlarged section on or radlator, an

prevent short circuitingi One end .ofthe wire 1s connected with t e core A, as shown at 4,.and the other end is connectedI with a terminal asat l5. The core A also has a terminal as at 6, and through these, connection may be made with a source of electrical energy. y

In order -to protect the whole we. have shown a flattened tube 7 within which the element'is inclosed. This tube may preferably be made by taking an ordinary cylindrical tube of such size as ma be necessa lattenin `it, introducing t e previous y named e ements into the tube, and then compressin the tube; firmlyupon a contained core o wires; a suitable insulator 8" bein interposed between this exterior tube. and

th'e'wires. The lower end of the tube is*V then the only portion that needs t0 be closed and sealed, and by having no oints upon the edges of the tube, there is l1ttle dan er of the device getting out of order. ments 'like this may be employed to heat small bodies ofliquids, such as Water, acid or saline solutions, or lluid with low resistances, where it is not possible `to employ the unprotected, wires which are only useful for 'such purposes when used in conjunction with fluids of high resistance. As many of these units may be'employed as may be found desirable toproduc'e the necessary degree 'of heat. We have found it advantageous to connect the terminals 5 and 6 near the cenand maket'wo coils, oneter of the device, connecting with each end of the core A as at 9--9 and having the opposite ends of the coilsY co'nnectin with the terminals .5 and 6 as shown, in Fig. 5. f By employing a series of these units, and compressing them between exterior pleates 10 as shown 1n Fig. 6, the device ma used as a heating stove,

by the employment of a suilicient number of these umts a very considerable heat may be developed.

Having thus described our invention, what we claim and desire to secure by Letters Patent is- 1. An electrical heating element consisting of a sin le conductlng core of solid metal, a con ucting resistance coil wound tion'inclosing the coil, an exterior closed seamlesstube flattened and compressed upon the outside of the exterlor insulation, said Sing e eletain-er adapted to receive a plurality of individual heating elements, and connections in series between said members. 1t

In testimony whereof we have hereunto setour hands in presence of two subscribing witnesses.

MILTON H. SHOENBERG. GEORGE T. MARSH.

Witnesses:

CHARLES A. PENFIELD, Taos. CABTBERG. 

